Improvement in rock-drilling machines



. ZSheets--Sheetll'rl [1. F'. DITT-M-AN.

Improvement vin Rock-Drilling Machines. No. 130,703. Patented-Aug.20,1872.

. 2Sheets-Sheet2.

v 1. F. D|-TTMA.N. Improvement in Reek-Drilling Machines.

. No. 130,703. 'Pafented Aug. 2o, 1872.

UNrrnn N S'rnfrns EN VFries.

JOSEPH F. DIT'IMAN, OF'IITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN ROCK-DRILLING MACHlNES.

To all whom it may concern:

i Be it known that I, J osEPH F. DITTMAN, of Pittsburg, in the countyofv Allegheny and State of Pennsylvania, have invented a certain new anduseful Improvement in Apparatus for Drilling Rock;` and I do herebydeclare that the following is a'full, clear, and exact descriptionthereof, referencebein g had to the accompanying drawing and to theletters of reference marked thereon.

The nature of my invention consists in the combination and arrangementof the several parts hereinafter described for lifting and dropping adrill, susceptible of being adjusted in its bearing or mandrel, which isrotated at each stroke of the drill.

In the accompanping drawing, which forms part of my specification,Figures l and 2 are side elevations of my improve mentin apparatus fordrilling rock. Fig. 3 is a front elevation of the same. Y Fig. 4 is adetached view, and represents a part of the mechanism used for feedingdown the drill. Fig. 5 is a detached view, representing thedriving-gear. Fig. 6 is a detached view, and represents the drill andits bearing or mandrel. Fig. 7 is a section of the base at line y ofFig. l. Fig. S is a detached view of the lower end of the column uponwhich the several parts of the drillingapparatus are supported. Fig. 9is a horizontal section of Fig. 3 at line g3. Fig. 10 is a fronteleva-tion of the frame, the drill being I removed.

In the accompanying drawing, A represents the base, which -is providedwith adjustable feet B held in a xed position by set-screws C. To thebase A is hinged, at D, the column E, which is provided with rack F,into which gears the wheel g, which is rotated by the endless screw h.,on "one end of which is a ratchet wheel,`f, which is rotated through themedium of the pall j, which is thrown back by a spring, 7c, and forwardby a rack, u', which has imparted to ita reciprocating motion throughthe medium of a spring, o', and a curved projection, s,',-on the innerface of the wheel n, as indicated at X', which operates against aprojection on the back ofthe rack n'. The shaft in the sleeve lo" isprovided with a lifter, Z' and a cog-wheel, a, which mesh into a wheel,o, which mesheslinto a wheel, m, on the axis of which is a lifter, m'.The hollow mandrel BI moves in bearings F', and is provided with acollar, a', and cog-wheel u, between which is placed,` at right angle tothe mandrel B1, a cross-head, w', t0 the outer ends of which are securedrods R and S, and to the lower en ds of these rods are attached springsw. On the back of the cross-head 'w' is a projection, r, whichis fittedtoa groove, .fain the frame A2, which moves up and down on the column Eby the operations of the wheel g. The axis oi' the endless screw h hasits bearing in a tubular bearing, h', th'eopenin g for the axis of theendless screw h being eccentric to the axis of the tubular bearing h',which has its bearing in the frame A2, and is provided with a lever, Z.,for rotating it for the purpose of throwing the endless screw in and outof gear with relation to the wheelwg. The drill C' is held in themandrel B1 through theV medium of a setscrew, By this arrangement of thedrill, hollow mandrel, and set-screw, the drill may be lowered for thepurpose of drilling any desire-d depth of hole in the rock for receptionof the blast. By pivoting the column E to the base A, as indicated at D,the drill and its operating mechanism may be set at any desired angleand held in position through the medium of the set-screw y1. The base Amay be set iirmly upon an uneven surface through the medium of theadjustable feet B and setscrews C. The mandrel B1 and its drill U' areprevented from turning in their downward movement by the rod D', two ofthe cogs always straddling the rod. To the wheel n is pivoted the upperend of a rod, 5, the lower end of which is connected to an arm, t,'whichis secured on one end of the shaft, to which the springs w are attachedand around which they are coiled. By thus connecting the axis of thecoils of the springs w with the wheel n an increased force is impartedto the drill in.HV

its descent.

As the construction and arrangement of the several parts of myimprovement in "rockdrill '7 will be readily understood from theforegoing description and by reference to the accompanying drawing, lwill therefore proceed.

to describe the operation of the several parts, which is as follows: Byturning the wheel B2 the wheel fm will revolve the wheel o, which willrevolvethe wheel a, which will revolve the shaft and lifter l', and theprojection s' r back of the reciprocating rack n at the moment thelifter l. comes in contact with the limb 2 of the piece w', theprojection s will move the rack n' forward, and its teeth or cogs willrotate the mandrel 1?l and drill C' while the lifter l is elevatingthem; the rack n' will also force forward the arm 3, lto which the pallj is pivoted, and thereby rotate the ratchet-wheel i, which will rotatethev endless screw h', which will turn the wheel g, which will cause theframe A2 to move slowly down on the column E. 'The lifter l having doneits office in elevating the mandrel B1 and drill C, the lifter m comesin contact with the limb 2 of the piece w and elevates the mandrel anddrill to their greatest height; and as soon as the lifter m has passedfrom under the limb 2 the springs fw, drawing on the rods R and S,attached to the piece w', will cause the mandrel and drill to descend,whereby the drill will cut into the rock. When the frame A2 has beenlowered down on the column E as low as the teeth or rack F will allow,the ope` rator raises up the lever l, which will unship the threads ofthe endless screw h from the cogs of the wheel g; he then, by means of acrank,

l?, placed on the axis-of the wheel g, elevates the frame Az on thecolumn E, after which he lowers the lever l., thereby shipping theendless screw h into gear with the wheel g; he then lowers the drill Cin the mandrel B1, and the drilling apparatus is then ready for a seconddrilling operation, the several parts operating y as before described.

Having thus described the nature, construction, and operation' of myimprovement, what I claim as of my invention is l. The combination andarrangement of the pivoted column E having a rack, F, frame A2, wheel g,endless screw h, wheel z', pawl j, arm 3, rack n', driving-wheels m n o,hollow mandrel B1, wheel u, crosshead w', litters l m', rods R S, andsprings w, all constructed and operating substantially as hereindescribed, and for the purpose set forth. v f

2. The hollow'mandrel B1 provided with a wheel, u, combined with thereciprocating rack n', projections s', and guide-rod D', substantiallyas herein described, and for the purpose set forth.

3. The arm t, rod 5, and wheel n, combined with the springs w and theaxis to which they are attached and around which they are coiled,substantially as herein described, and for the purpose set forth.

l JOSEPH F. DlTTMAN.

Witnesses:

" A. C.JoHNsToN, J. G. THOMPSON.

